By Wen Tsung Lin and Tim Homiller, Jerrold - Applied Media Lab

A study of the theoretical
calculations of noise in a CATV system
and the methods to measure the noises
is presented.
This paper is focused on the
effect of phase noise on the
signal-to-noise ratio (S/N). It is
well known that excessive phase noise
will degrade the S/N but lack of
understanding of the exact relationship
between phase noise and S/N causes
unneccessary confusion about the
importance of phase noise. It is the
purpose of this paper to clarify the
significance of phase noise and provide
a detailed calculation and measurement
method for phase noise and its
conversion to S/N.